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The hydrothermal technique is introduced into the synthesis of glutathione-stabilized ZnCdSe QDs. By incorporating cadmium ions into the pre-prepared ZnSe QDs, with continuously heating, the preparation of alloyed ZnCdSe QDs was realized. The bandgap emission dominated the emission spectra in 15 minutes.

Abstract: Nanoparticle from group II-IV semiconductor nanoparticles is widely studied for solar cells. The ability to modify the surface of nanoparticle is significant to successful use in various applications. In this research, mercaptoundecionic acid (MUA) and trioctyl phosphine oxide (TOPO) were used as ligand for cadmium selenide (CdSe) nanoparticles. The wavelength shift to a shorter value observed due to decreasing size of CdSe nanoparticle after ligand exchange from TOPO to MUA. The electrophoretic deposition methods (EPD) have being employed to deposite CdSe nanoparticles films on fluorine doped tin oxide (FTO). The deposition voltages used are between 100 - 400 V for 15 minutes. From SEM results show the formation layer of CdSe nanoparticles capped with MUA is strong and porous as compared to CdSe nanoparticle capped with TOPO. MUA capped CdSe shows better cell efficiency compared to TOPO capped CdSe which is 0.1735 %.

Abstract: The biosynthesis of nanostructures using plant extract (green chemistry) has emerged as an ecofriendly and evergreen branch of nanoscience and nanotechnology for the development of biomedical applications. In this study we report the use of aqueous extractof the latex of Thevetia peruviana (TP) for the synthesis of gold nanoparticles (AuNPs). The reaction time was optimized for maximum yield of AuNPs. The AuNPs formed were characterized using FTIR, EDS, TEM and XRD. The formation of AuNPs was confirmed using SPR spectra observed at around 589 nm. XRD pattern shows the FCC crystal structure of the nanoparticles, orresponding to (111), (200), (220) and (311) faces of gold. TEM analysis revealed that the particles are spherical with size distributions ranging from 41-50 nm. HRTEM image showed 2.35Å interplaner spacing. FTIR analysis confirmed that the flavonoid and reducing sugar found in the extract were the main reductive and the protein was capping components in the biosynthesis of AuNPs.

Abstract: An effective approach was used to disperse CdSe quantum dots (QDs) into epoxy matrix and prepare highly transparent luminescent CdSe–epoxy nanocomposites. Dodecylamine-capped CdSe QDs were obtained through self-assembly of carbon chains of as-synthesized QDs and dodecylamine. It was found that dodecylamine-capped CdSe QDs demonstrate a homogeneous dispersion within epoxy matrix, thus the prepared CdSe–epoxy nanocomposites expressed transparence in the visible region and also light-emitting.